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Phenylalanine and tyrosine play a central role in Gloriosa superba L. calluses for the production of colchicine. The lack of biosynthetic precursors and signal inducing enzyme activity are responsible for the lower production of colchicine in vitro. B 5 medium nutrient grown calluses have a low content of colchicine, indicating that an optimal precursors level is required to increase PAL and TAL activity...
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